<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>布局</title>
    <style>

        .container {

            width: 960px;
            margin-left: auto;
            margin-right: auto;
        }
        .row{
            width: 100%;
        }

        .col-4,.col-6{
            float: left;
        }

        .col-4{
            width: 40%;
        }

        .col-4{
            width: 60%;
        }
    </style>
</head>
<body>

<!--上左右-->
<!--上左中右下-->

<div class="container">
    <div class="row">
        <h1>xxx系统</h1>
    </div>

    <div class="row">
        <div class="col-4">
            <ul>
                <li>模块1</li>
                <li>模块2</li>
                <li>模块3</li>
            </ul>
        </div>
        <div class="col-6">6</div>
    </div>
</div>

</body>
</html>